Electronic apparatus

ABSTRACT

According to one embodiment, an electronic apparatus includes a printed circuit board, a heat pipe, a fan unit and a fixing unit. The heat pipe has a first end physically fixed to and thermally connected to a first circuit component, and a second end opposite to the first end. The fan unit is provided in the vicinity of the second end of the heat pipe, and cools the second end. The fixing unit fixes the position of the heat pipe at a position different from the position of the first circuit component.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is based upon and claims the benefit of priority fromJapanese Patent Application No. 2010-090894, filed Apr. 9, 2010; theentire contents of which are incorporated herein by reference.

FIELD

Embodiments described herein relate generally to an electronic apparatuscomprising a heat pipe.

BACKGROUND

Electronic apparatus in recent years include circuit components of highpower, such as a CPU, at high density. Since the circuit components,such as semiconductor devices, are highly integrated and performinformation processing at high speed, the circuit components generate alarge amount of heat. Therefore, in the electronic apparatus, it isimportant how to process heat emitted from the circuit components. As astructure for discharging heat generated by the circuit components, aheat pipe is generally used. The heat pipe transfers the heat generatedat the circuit components to heat radiating fins provided in thevicinity of a fan. The heat transferred to the heat radiating finsthrough the heat pipe is discharged to the outside of the apparatus byair blown by the fan.

There is a demand for the above-described heat radiation structure toprovide higher stabilization to a holding structure for holding the heatpipe.

BRIEF DESCRIPTION OF THE DRAWINGS

A general architecture that implements the various feature of theembodiments will now be described with reference to the drawings. Thedrawings and the associated descriptions are provided to illustrate theembodiments and not to limit the scope of the invention.

FIG. 1 is an exemplary perspective view showing a portable computerwhich is an example of an electronic apparatus according to a firstembodiment.

FIG. 2 is an exemplary perspective view showing a printed circuit board,a heat pipe, a fan unit, and a fixing unit contained in a housing of theportable computer shown in FIG. 1.

FIG. 3 is an exemplary elevational view of the printed circuit board,heat pipe, fan unit, and fixing unit shown in FIG. 2, which shows anexample of the fixing unit according to the first embodiment.

FIG. 4 is an exemplary elevational view of the printed circuit board,heat pipe, fan unit, and fixing unit shown in FIG. 2, which showsanother example of the fixing unit according to the first embodiment.

FIG. 5 is an exemplary elevational view schematically showing theprinted circuit board, first circuit component and heat pipe.

FIG. 6 is an exemplary elevational view showing a state where a momentacts on the heat pipe.

FIG. 7 is an exemplary elevational view showing a printed circuit board,a heat pipe, a fan unit, a fixing unit, and a reinforcing plate of aportable computer which is an example of an electronic apparatusaccording, to a second embodiment.

FIG. 8 is an exemplary elevational view schematically showing a printedcircuit board, a heat pipe, a fan unit, and a fixing unit of a portablecomputer which is an example of an electronic apparatus according to athird embodiment.

FIG. 9 is an exemplary enlarged elevational view of the printed circuitboard, first circuit component and heat pipe shown in FIG. 8.

FIG. 10 is an exemplary cross-sectional view schematically showing aprinted circuit board, a heat pipe, fan unit, and a fixing unit of aportable computer which is an example of an electronic apparatusaccording to a fourth embodiment.

DETAILED DESCRIPTION

Various embodiments will be described hereinafter with reference to theaccompanying drawings.

In general, according to one embodiment, referring to FIGS. 1-6, a firstembodiment of an electronic apparatus will be described. In thisspecification, the near side to the user (that is, user side) is definedas front F, the far side from the user is rear R, the left-hand side ofthe user is left, the right-hand side of the user is right, the upperside from the user's position is up and the lower side from the user'sposition is down.

As shown in FIG. 1, a portable computer 11, which is an example of theelectronic apparatus, comprises a main unit 12, a display unit 13, and ahinge 14 provided between the main unit 12 and the display unit 13. Thehinge 14 rotatably supports the display unit 13.

The display unit 13 comprises a display 15 and a plastic display case 16surrounding a periphery of the display 15. In the present embodiment, aliquid crystal display is used as the display 15.

As shown in FIGS. 1 and 2, the main unit 12 comprises, for example, abox-shaped plastic housing 21, a keyboard 22 attached to a top surfaceof the housing 21, a tough pad 23 provided on the top surface of thehousing 21, and a printed circuit board 24 contained in the housing 21.The housing 21 comprises a first case 21A which forms the upper half ofthe housing 21 and to which the keyboard 22 is fixed, and a second case21B which forms the lower half of the housing 21. As shown in FIG. 10,the first case 21A is opposed to a first surface 24A of the printedcircuit board 24. The second case 21B is opposed to a second surface 24Bof the printed circuit board 24.

As shown in FIGS. 2 and 3, the main unit 12 further comprises within thehousing 21: the printed circuit board 24 including the first surface 24Aon which a first circuit component 25 is mounted and the second surface24B opposite to the first surface 24A; a fan unit 26 for promoting heatradiation of the first circuit component 25; and a heat pipe 27including a first end 27A connected to the first circuit component 25and a second end 27B opposite to the first end 27A. Moreover, the mainunit 12 comprises within the housing 21: a fixing unit 31 which fixesthe heat pipe 27 to the printed circuit board 24; a fin unit 32 fixed tothe second end 27B of the heat pipe 27; a reinforcing plate 33 fixed tothe second surface 24B of the printed circuit board 24; and a bracket 34which fixes the fin unit 32 to the fan unit 26.

The reinforcing plate 33 comprises a first portion 33A corresponding tothe first circuit component 25 and a second portion 33B corresponding toa position 35 different from the position of the first circuit component25 as separate parts. Namely, the first portion 33A and second portion33B of the reinforcing plate 33 are separated in the first embodiment.

The printed circuit board 24 comprises a printed wiring board 36 and thefirst circuit component 25 mounted on the printed wiring board 36. Thefirst circuit component 25 is formed of an electronic component such asa CPU. On the first surface 24A of the printed circuit board 24, asecond circuit component 52 or a spacer 54 mentioned later is attachableat the position 35 different from the position of the first circuitcomponent 25.

The heat pipe 27 is formed by filling a tubular copper heat pipe bodywith a working fluid which is transitional between a gas phase and aliquid phase. The working fluid is, for example, pure water, but may beanother liquid such as alcohol.

The first end 27A of the heat pipe 27 is physically fixed and thermallyconnected to the first circuit component 25. More specifically, thefirst end 27A is pushed to a part of a die 38 of the first circuitcomponent 25 by a holder 37. The holder 37 comprises a plurality ofstuds 41 provided around the first circuit component 25, a holding plate42, which is a plate spring, and screws 43 which fix the holding plate42 to the studs 41. A square heat receiving plate 44 made of a coppermaterial is interposed between the first end 27A of the heat pipe 27 andthe die 38 of the first circuit component 25, and thermally connects thefirst end 27A and the die 38. Between the heat receiving plate 44 andthe die 38, thermally-conductive grease or the like may be interposed toincrease adherence.

The second end 27B of the heat pipe 27 is located in the vicinity of anoutlet (not shown) of the fan unit 26. To the second end 27B, the finunit 32 is fixed by, for example, brazing (soldering). The fin unit 32can improve heat radiation performance of the heat pipe 27 at the secondend 27B. The fin unit 32 is opposed to and in close contact with theoutlet of the fan unit 26. The fin unit 32 integrally comprises aplurality of first fins 32A (longitudinal fins) extending in a directionintersecting (orthogonal to) a direction in which the second end 27B ofthe heat pipe 27 extends, and a plurality of second fins 32B (lateralfins) extending in a direction along (parallel to) the direction inwhich the second end 27B extends.

The fan unit 26 is located in the vicinity of the second end 27B to beopposed to the second end 27B of the heat pipe 27. The fan unit 26comprises a box-shaped fan case 45, a fan body 46 rotatably provided inthe fan case 45, and a motor 47 which rotates the fan body 46. The fancase 45 comprises an inlet part 51 and an outlet (not shown). The fanunit 26 blows air to the second end 27B of the heat pipe 27, and coolsthe second end 27B.

The bracket 34 is made of a stainless material to take an L-shape, andfixes the fin unit 32 to the fan unit 26 to be integral with each other.In other words, the fan unit 26 is fixed to the second end 275 of theheat pipe 27 via the bracket 34 and fin unit 32. Accordingly, in thisstructure of the present embodiment, a large moment acts on the firstend 27A of the heat pipe 27 due to the load of the heat pipe 27 and theloads of the fin unit 32 and fan unit 26, as mentioned later.

The fixing unit 31 fixes the position of the heat pipe 27 at theposition 35 different from the position of the first circuit component25, thereby suppressing displacement of the heat pipe 27 in a thicknessdirection of the printed circuit board 24. The fixing unit 31 is locatedcloser to the fan unit 26 than the first circuit component 25, and isfixed to the heat pipe 27.

As shown in FIG. 3, in an example of the present embodiment, the fixingunit 31 comprises a second circuit component 52 mounted on the printedcircuit board 24, a plurality of studs 41 surrounding a periphery of thesecond circuit component 52, a connecting member 53 for pushing the heatpipe 27 to the second circuit component 52. The connecting member 53 isa spring plate, and connects the heat pipe 27 to the printed circuitboard 24. The second circuit component 52 is, for example, a graphicschip provided for reinforcing an image function of the portable computer11. The second circuit component 52 is located between the heat pipe 27and the printed circuit board 24.

As another example of the present embodiment, the fixing unit 31 mayhave the structure shown in FIG. 4. Specifically, the fixing unit 31 ofthis example comprises a spacer 54 mounted on the printed circuit board24, a plurality of studs 41 surrounding a periphery of the secondcircuit component 52, and a connecting member 53 for pushing the heatpipe 27 to the second circuit component 52. The spacer 54 is, forexample, made of a plastic material to take the same shape as the secondcircuit component 52, i.e., formed to have the same height as the secondcircuit component 52, and is located between the heat pipe 27 and theprinted circuit board 24. The spacer 54 may be made of a rubbermaterial. Except for the fixing unit 31, the structure shown in FIG. 3is the same as the structure shown in FIG. 4.

Referring to FIGS. 5 and 6, effectiveness of providing the fixing unit31 on the printed circuit board 24 as in the present embodiment will bedescribed. FIG. 5 schematically shows a connection structure of thefirst end 27A of the heat pipe 27 and the heat receiving plate 44 withthe die 38 of the first circuit component 25. As mentioned above, forexample, when the portable computer 11 is carried by a user, or when theportable computer 11 is subjected to vibration or shock, the loads ofthe heat pipe 27 itself, fin unit 32 and fan unit 26 are imposed on thefirst end 27A of the heat pipe 27, and a large moment acts on the firstend 27A of the heat pipe 27. As schematically shown in FIG. 6, let usassume that the heat pipe 27 is pushed downward at this moment, forexample. An edge 38A of the die 38 is subjected to a great pressure, andin the worst case, the edge 38A of the die 38 may be damaged. However,in the present embodiment, in addition to the part fixing the first end27A to the first circuit component 25, the fixing unit 31 for fixing theheat pipe 27 to the printed circuit board 24 is provided. Therefore, theload (moment) imposed on the vicinity of the first end 27A of the heatpipe 27 is shared by the vicinity of the fixing unit 31, therebypreventing the die 38 of the first circuit component 25 from beingdamaged.

According to the first embodiment, the portable computer 11 comprises:the printed circuit board 24 comprising the first surface 24A on whichthe first circuit component 25 is mounted and the second surface 24Bopposite to the first surface 24A; the heat pipe 27 comprising the firstend 27A physically fixed and thermally connected to the first circuitcomponent 25 and the second end 27B opposite to the first end 27A; thefan unit 26 which is provided in the vicinity of the second end 27B ofthe heat pipe 27 and cools the second end 27B; and the fixing unit 31which is provided on the first surface 24A of the printed circuit board24, is located closer to the fan unit 26 than the first circuitcomponent 25 and fixed to the heat pipe 27, and suppresses thedisplacement of the heat pipe 27 in the thickness direction of theprinted circuit board 24.

When a circuit component is cooled by means of the heat pipe 27 in theportable computer 11, the heat pipe 27 functions as a lever, and thepart fixing the heat pipe 27 to the circuit component tends to besubjected to a load (stress). This phenomenon increases the load on theprinted circuit board 24, and when the heat pipe 27 is longer, it isrequired to more carefully fix the heat pipe 27 to the printed circuitcomponent 24. In the above-described structure, the fixing unit 31 islocated closer to the fun unit 26 than the first circuit component 25.Therefore, vibration of the heat pipe 27 can be suppressed even when theportable computer 11 is subjected to shock or vibration. Accordingly, amoment caused by the load of the heat pipe 27 itself does notconcentrate on the fixing part in the vicinity of the first end 27A ofthe heat pipe 27. Consequently, it is possible to effectively prevent,for example, damage to the first circuit component 25 and damage to theprinted circuit board 24 caused by the moment which acts on the vicinityof the first end 27A of the heat pipe 27.

In addition, the second circuit component 52 can be mounted at aposition from the position of the first circuit component 25 on thefirst surface 24A of the printed circuit board 24, and the fixing unit31 comprises: the connecting member 53 connecting the heat pipe 27 tothe printed circuit board 24; and one of the second circuit component 52provided between the heat pipe 27 and the printed circuit board 24 andthe spacer 54 provided between the heat pipe 27 and the printed circuitboard 24 and having the same height as the second circuit component 52.

A market of portable computer 11 provides a wide variety of modelshaving various functions, such as a model in which a graphics chip isprovided to enhance an imaging function and a model only for the use ofword processing function, in accordance with use purposes of users.According to the above-described embodiment, if the portable computer 11has the above-described structure, the fixing unit 31 can be provided atthe position 35 different from the position of the first circuitcomponent 25 on the printed circuit board 24 regardless of the presenceor absence of the second circuit component 52. Consequently, it ispossible to effectively prevent, for example, damage to the firstcircuit component 25 and printed circuit board 24. This structure isespecially effective for a case where a high function model and a lowprice model having the same appearance are prepared. In addition, amodel comprising the second circuit component 52 and a model notcomprising the second circuit component 52 can use the heat pipe 27 andthe connecting member 53 as common parts, and manufacturing costs can bereduced.

Moreover, the portable computer 11 comprises the bracket 34 for fixingthe fan unit 26 to the second end 27B of the heat pipe 27. The bracket34 integrates the fan unit 26 with the second end 27B, and the load ofthe fan unit 26 is also imposed on the heat pipe 27. However, in spiteof such a structure, the fixing unit 31 can effectively prevent thefirst circuit component 25 and printed circuit board 24 from beingdamaged.

Referring to FIG. 7, a second embodiment of the electronic apparatuswill be described. The portable computer 11 which is an example of theelectronic apparatus of the second embodiment is different from that ofthe first embodiment in terms of the shape of the reinforcing member 33.However, the other elements are the same as those of the firstembodiment. Therefore, different elements will be mainly explained, andthe same elements will be assigned the same reference symbols, and theexplanations thereof will be omitted. The portable computer 11 of thesecond embodiment has the same appearance as the one shown in FIG. 1.

The reinforcing plate 33 is fixed to the second surface 24B of theprinted circuit board 24. The reinforcing plate 33 comprises a firstportion 33A corresponding to the first circuit component 25 and a secondportion 33B corresponding to the position 35 different from the positionof the first circuit component 25. The position 35 different from theposition of the first circuit component 25 is a position at which thesecond circuit component 52 or spacer 54 is located.

In the present embodiment, the reinforcing plate 33 comprises aconnecting portion 33C connecting the first portion 33A to the secondportion 33B, and the connecting portion 33C integrates the first portion33A with the second portion 33B.

According to the second embodiment, the portable computer 11 comprisesthe reinforcing plate 33 fixed to the second surface 24B of the printedcircuit board 24, and the reinforcing plate 33 integrally comprises thefirst portion 33A corresponding to the first circuit component 25 andthe second portion 33B corresponding to the position 35 different fromthe position of the first circuit component 25. When the fixing unit 31for fixing the heat pipe 27 to the printed circuit board 24 is furtherprovided on the printed circuit board 24, the printed circuit board 24may be curved toward the heat pipe 27. The above-described structureincreases the strength of the printed circuit board 24 and prevents theprinted circuit board 24 from being curved, thereby effectivelypreventing the printed circuit board 24 from being damaged.

Referring to FIGS. 8 and 9, a third embodiment of the electronicapparatus will be described. The portable computer 11 which is anexample of the electronic apparatus of the third embodiment is differentfrom that of the first embodiment in terms of the shape of the firstcircuit component 25. However, the other elements are the same as thoseof the first embodiment. Therefore, different elements will be mainlyexplained, and the same elements will be assigned the same referencesymbols, and the explanations thereof will be omitted. The portablecomputer of the third embodiment has the same appearance as the oneshown in FIG. 1.

FIG. 8 schematically shows the first circuit component 25 on the printedcircuit board 24 and a cooling structure for cooling the first circuitcomponent 25. Different from the above-described embodiments, the firstcircuit component 25 comprises a plurality of dies 38. In the presentembodiment, the first circuit component 25 comprises, for example, twodies 38 corresponding to two chips contained in the first circuitcomponent 25. As in the present embodiment, a plurality of dies 38 maybe formed in correspondence with the number of chips contained in thecircuit component. The first end 27A of the heat pipe 27 is thermallyconnected to the two dies 38 via the heat receiving plate 44.

Referring to FIG. 9, effectiveness of providing the fixing unit 31 onthe printed circuit board 24 as in the present embodiment will bedescribed. FIG. 9 schematically shows a connection structure of thefirst end 27A of the heat pipe 27 and the heat receiving plate 44 withthe dies 38 of the first circuit component 25. When the portablecomputer 11 is carried by a user, or subjected to vibration or shock,the loads of the heat pipe 27 itself, radiator 32 and fan unit 26 areimposed on the first end 27A of the heat pipe 27, and a large moment isapplied to the first end 27A of the heat pipe 27. As schematically shownin FIG. 9, let us assume, for example, the heat pipe 27 is pusheddownward at this moment. A large pressure is applied to the die 38 onthe right in FIG. 9, and in the worst case, the edge 38A of the die 38may be damaged. Further, the heat receiving plate 44 is raised from thedie 38 on the left in FIG. 9, and the thermal connection between the die38 on the left and the heat pipe 27 is cut.

However, in the present embodiment, in addition to the part fixing thefirst end 27A to the first circuit component 25, the fixing unit 31 forfixing the heat pipe 27 to the printed circuit board 24 is provided.Therefore, the load (moment) imposed on the vicinity of the first end27A of the heat pipe 27 can be shared by the vicinity of the fixing unit31.

According to the third embodiment, the first circuit component 25comprises the plurality of dies 38 which are cooled by the heat pipe 27.With this structure, the heat pipe 27 tends to be raised. However, thefixing unit 31 prevents one die 38 from being damaged, and prevents theheat pipe 27 from being raised from the other die 38 to prevent a casewhere the other die 38 cannot be cooled.

Next, referring to FIG. 10, a fourth embodiment of the electronicapparatus will be described. The portable computer 11 which is anexample of the electronic apparatus of the fourth embodiment isdifferent from that of the first embodiment in terms of the position ofthe fixing unit 31. However, the other elements are the same as those ofthe first embodiment. Therefore, different elements will be mainlyexplained, and the same elements will be assigned the same referencesymbols, and the explanations thereof will be omitted. The portablecomputer 11 of the fourth embodiment has the same appearance as the oneshown in FIG. 1.

In the present embodiment, a pair of portions of the fixing unit 31 areprovided on the inner surface of the housing 21. Namely, the fixing unit31 comprises a first elastic body 61 provided between the fin unit 32and the first case 21A and a second elastic body 62 provided between thefin unit 32 and the second case 21B. The first elastic body 61 isadhered to the inner surface of the first case 21A, and a small gap isformed between the first elastic body 61 and the fan unit 32. The secondelastic body 62 is adhered to the inner surface of the second case 21B,and a small gap is formed between the second elastic body 62 and the finunit 32. The first elastic body 61 and second elastic body 62 can fixthe heat pipe 27 in a predetermined position at the position 35different from the position of the first circuit component 25.

The first elastic body 61 and second elastic body 62 are each formed of,for example, elastic sponge, but may be formed of any elastic material,such as rubber. The fixing unit 31 can hold the second end 27B of theheat pipe 27 in a predetermined position. Further, in the presentembodiment, the electronic apparatus comprises a bracket 34 which is thesame as the bracket 34 shown in FIG. 2, and the bracket 34 fixes the fanunit 26 to the second end 27B of the heat pipe 27.

According to the fourth embodiment, the portable computer 11 comprisesthe fin unit 32 which is fixed to the second end 27B of the heat pipe 27and can improve the heat radiation efficiency of the second end 27B, thehousing 21 comprises the first case 21A opposed to the first surface 24Aof the printed circuit board 24 and the second case 21B opposed to thesecond surface 24B of the printed circuit board 24, and the fixing unit31 comprises the first elastic body 61 provided between the fin unit 32and the first case 21A and the second elastic body 62 provided betweenthe fin unit 32 and the second case 21B.

According to the fourth embodiment, the fin unit 32 can be held in apredetermined position by the first elastic body 61 and the secondelastic body 62 with the simple structure. Therefore, the second end 27Bof the heat pipe 27 is held in a predetermined position, and vibrationof the heat pipe 27 can be suppressed. Consequently, a moment does notact on the vicinity of the first end 27A of the heat pipe 27, and thefirst circuit component 25 and printed circuit board 24 can be preventedfrom being damaged. The fixing unit 31 of the present embodiment isadvantageous especially in preventing vibration of the heat pipe 27 whenthere is no space for mounting the fixing unit 31 on the printed circuitboard 24.

In addition, the portable computer 11 comprises the bracket 34 forfixing the fan unit 26 to the second end 27B of the heat pipe 27. Thisstructure integrates the fan unit 26 with the second end 27B, therebyimposing the load of the fan unit 26 on the heat pipe 27. However, thefixing unit 31 can effectively prevent the case where the first circuitcomponent 25 and printed circuit board 24 are damaged.

The electronic apparatus is not limited to the portable computer 11described in the above embodiments, and may be another electronicapparatus such as a mobile telephone set. The electronic apparatus maybe variously modified within the spirit of the invention in the stage ofimplementation.

While certain embodiments have been described, these embodiments havebeen presented by way of example only, and are not intended to limit thescope of the inventions. Indeed, the novel embodiments described hereinmay be embodied in a variety of other forms; furthermore, variousomissions, substitutions and changes in the form of the embodimentsdescribed herein may be made without departing from the spirit of theinventions. The accompanying claims and their equivalents are intendedto cover such forms or modifications as would fall within the scope andspirit of the inventions.

1. An electronic apparatus, comprising: a printed circuit boardcomprising a first surface and a second surface opposite to the firstsurface, wherein a first circuit component is on the first surface; aheat pipe comprising a first end connected to the first circuitcomponent, and a second end opposite to the first end; a fan facing thesecond end of the heat pipe and configured to blow air toward the secondend; and a fixing unit on the first surface of the printed circuitboard, located closer to the fan than the first circuit component, fixedto the heat pipe, and configured to suppress displacement of the heatpipe in a thickness direction of the printed circuit board.
 2. Theelectronic apparatus of claim 1, wherein a second circuit component isattachable at a position different from a position of the first circuitcomponent on the first surface of the printed circuit board, and thefixing unit comprises: a connecting member configured to connect theheat pipe to the printed circuit board; and one of the second circuitcomponent between the heat pipe and the printed circuit board, and aspacer between the heat pipe and the printed circuit board and equal inheight to the second circuit component.
 3. The electronic apparatus ofclaim 2, further comprising a bracket configured to fix the fan to thesecond end of the heat pipe.
 4. The electronic apparatus of claim 3,further comprising a reinforcing plate fixed to the second surface ofthe printed circuit board, the reinforcing plate integrally comprising afirst portion corresponding to the first circuit component and a secondportion corresponding to the position different from the position of thefirst circuit component.
 5. The electronic apparatus of claim 4, whereinthe first circuit component comprises a plurality of dies configured tobe cooled by the heat pipe.
 6. An electronic apparatus, comprising: aprinted circuit board comprising a first surface and a second surfaceopposite to the first surface, wherein a first circuit component is onthe first surface; a heat pipe comprising a first end connected to thefirst circuit component, and a second end opposite to the first end; afan facing the second end of the heat pipe and configured to blow airtoward the second end; and a fixing unit configured to fix the heat pipeat a position different from a position of the first circuit component.7. The electronic apparatus of claim 6, further comprising a housing anda fin unit fixed to the second end of the heat pipe, wherein the housingcomprises a first case opposed to the first surface of the printedcircuit board and a second case opposed to the second surface of theprinted circuit board, and the fixing unit comprises a first elasticbody between the fin unit and the first case, and a second elastic bodybetween the fin unit and the second case.
 8. The electronic apparatus ofclaim 7, further comprising a bracket configured to fix the fan to thesecond end of the heat pipe.